Automatic firearm



Aug. 7, 1928, I R. VON FROMMER AUTOMATIC FIREARM Filed April 26, 1924' Patented Aug. 7, 1928.

RUDOLF VON FROMMER, F BUDAPEST, HUNGARY.

AUTOMATIC FIREARM.

Application filed Apri1.26, 1924, Serial No. 709,202, and in Austria May 29, 1923.

' In the application filed August25,'1921,

. Serial Number 495,179, an automaticfirearm is described that may be taken apart with great. ease and rapidity and is provided with a pull-off mechanism containing a hammer in which the connection between the slide and the breech-block is established by a cap with or without ahelmet-like extension, whereby two types of firearms can be provided, i. e. such with an external hammer, or such with a hammer hidden within the helmet-like extension that is a so called hammerless-piston.

Now I have ascertained that by suitably shaping the cap enclosing the hammer the same can be used not only in connection with the firearm described in the application above referred to, but also in connection with other firearms provided with an. external hammer, whereby a further development of the progress of art described in the patent above referred to, of manufacturing two types of firearms with one and the same plant is attained, any types of firearms with external hammer being enabled by the cap according to my present invention tobe converted into a hammerless one by mere putting on of the cap.-

' The cap described in my patent aboved referred to formed an integral part of the weapon without which the firearm would not be complete; whilstthe cap according to this invention does not form an absolutely necessary part of the weapon but is only intended to change a hammer-pistol into a hammerless one. Q

The cap enclosing the hammer may be connected with the weapon in a number of difierent ways, i. e., by screw threads, pressing, or screwing up, etc. I

In the accompanying drawing one form of the cap embodying the present invention is shown by way of example in connection with a' firearm of usual type.

Fig. 1 is a side view of one part of a firearm having a pull-oft mechanism containing a hammer;

Fig. 2 is a side view of the cap; 1

Fig. 3 shows the cap in connection with the firearm shown'in Fig. 1, V

.ing of the same.

sliding it downward (Fig. 3), a firm vconmotion between the breech-slide '1 and cap 3 is attained, and the hammer is completely hidden within the cap, whereby the hammerpistol is changedinto a socalled hammerless one. The outside of the cap is also provided with recesses to render the handling of the breech-slide easier.

The securing of the cap 3 on the breechslide .1 is effected in the example shown by a catch 8 subject to the pressure of spiral spring 7 The catch 8 enters the bore 9 of the cap, and thus prevents the same to be unintentionally disengaged from the breechslide. v

Claims:

open at its front side and at its bottom, adapted to be fastened on the breech of a firearm having an external hammer for completely hiding thehammer of the weapon and having an outline similar to the breech of a hammerless firea-rm,"therebyigiving the V 1. As a new article of'manufacture, a cap weapon the outside form of a hammerless weapon and provided'on its inner surface with recesses and edges to fit in the recess of. the breech .of a weapon, enabling the cap to be slid athwart the breech for concealing the external hammer of the weapon.

2. As a new article of manufacture, 'a cap 2 i open at its frontwside and'at its bottom,

adapted-to be fastenedongthe breech of a cess capable of receiving a spring bolt of the breech of the weapon and concealing the external hammer of the weapon.

I '3. As a new article ofman ufacturg an inverted channel shaped cap adapted to be attached to a. firearm for concealing the ham Iner of the latter, the'inner surfaces ofjthe sides of the cap being provided with corrugmtions adapted toicooperate with complementery corrugations on the breech of a Weapon; said cap having a'recess to receive RUDOLF oN' FROMMER. 

